A) X stays the same, Y decreases.
B) X increases, Y decreases
C) X increases, Y stays the same
D) X decreases, Y increases
Correct Answer: B
Solution :
[b] \[P=\frac{{{V}^{2}}}{R}\] Initially, \[I=\frac{V}{2R}\] Power across \[{{P}_{X}}={{P}_{Y}}=\left( \frac{{{V}^{2}}}{4R} \right)R\] Finally, \[I=\frac{2V}{3R},\] Power \[{{P}_{x}}=\frac{4{{V}^{2}}}{9R},\] \[{{P}_{y}}={{P}_{z}}=\frac{2{{V}^{2}}}{9R}\] Hence P increases, \[{{P}_{y}}\] decreases.
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